汶川MS8.0大震前后鲜水河断裂带滑动及其西部地壳形变的动态变化  

The Sliding of Xianshui River Fault Before and After Wenchuan M_S8.0 Earthquake and Its Dynamic Changes of Western Crustal Deformation

作　　者：陈欣[1] 杨国华[1] CHEN Xin;YANG Guohua(The First Monitoring and Application Center,CEA,Tianjin 300180,China)

机构地区：[1]中国地震局第一监测中心,天津300180

出　　处：《华北地震科学》2020年第3期27-31,37,共6页North China Earthquake Sciences

基　　金：科技基础性工作专项资助项目(2015FY210400);地震科学数据共享项目课题“跨断层数据产品数据集”(SJGX-2019-02-01)。

摘　　要：基于鲜水河断裂带及邻近区域GPS资料,以发生汶川MS8.0大震的2008年为时间节点,利用视错动变形系统分析模型研究了鲜水河断裂带及邻区不同时段的滑动与区域形变活动特征,结果表明:汶川大震前后鲜水河断裂带构造活动的动态变化是显著的,其西部地区地壳形变的动态变化也较清晰,这些不仅说明了汶川大震的孕育在较大的空间范围存在不同特征的形变与构造活动,同时其西部地区也存在着疑似断裂带形变中心的地壳动态变化,这可能与特定的构造和动力环境密切相关,为我们识别大震前兆提供了更多的可能。Based on the GPS repetition measurement data of the Xianshui river fault and adjacent area,taking the 2008 Wenchuan Ms8.0 earthquake as the time node,the characteristics of the sliding and regional deformation activities of Xianshui river fault and the adjacent area are studied by using the dynamic deformation system analysis model.The following results and views are obtained:The dynamic change of the tectonic activity of the Xianshui river fault before and after the Wenchuan earthquake is remarkable,and the dynamic change of crustal deformation in the west of the fault is also clear.These not only indicate that there are different characteristics of deformation and tectonic activities in the larger space range of Wenchuan earthquake.At the same time,there is similar deformation center in the west of the fault.This may be closely related to the specific structure and dynamic environment,and providing more possibilities for us to identify the precursors of large earthquakes.

关 键 词：汶川MS8.0大震 鲜水河断裂带活动 区域变形 动态变化 变形系统分析模型 

分 类 号：P315.2[天文地球—地震学]